61131021392 has 40 divisors (see below), whose sum is σ = 139728056832. Its totient is φ = 25353878400.

The previous prime is 61131021377. The next prime is 61131021407. The reversal of 61131021392 is 29312013116.

61131021392 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61131021377) and next prime (61131021407).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8799959 + ... + 8806902.

Almost surely, 2^61131021392 is an apocalyptic number.

61131021392 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

61131021392 is an abundant number, since it is smaller than the sum of its proper divisors (78597035440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61131021392 is a wasteful number, since it uses less digits than its factorization.

61131021392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17606907 (or 17606901 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The spelling of 61131021392 in words is "sixty-one billion, one hundred thirty-one million, twenty-one thousand, three hundred ninety-two".